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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libm/] [s_frexp.c] - Rev 1771
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/* @(#)s_frexp.c 5.1 93/09/24 */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */ #if defined(LIBM_SCCS) && !defined(lint) static char rcsid[] = "$NetBSD: s_frexp.c,v 1.9 1995/05/10 20:47:24 jtc Exp $"; #endif /* * for non-zero x * x = frexp(arg,&exp); * return a double fp quantity x such that 0.5 <= |x| <1.0 * and the corresponding binary exponent "exp". That is * arg = x*2^exp. * If arg is inf, 0.0, or NaN, then frexp(arg,&exp) returns arg * with *exp=0. */ #include "math.h" #include "math_private.h" #ifdef __STDC__ static const double #else static double #endif two54 = 1.80143985094819840000e+16; /* 0x43500000, 0x00000000 */ #ifdef __STDC__ double frexp(double x, int *eptr) #else double frexp(x, eptr) double x; int *eptr; #endif { int32_t hx, ix, lx; EXTRACT_WORDS(hx,lx,x); ix = 0x7fffffff&hx; *eptr = 0; if(ix>=0x7ff00000||((ix|lx)==0)) return x; /* 0,inf,nan */ if (ix<0x00100000) { /* subnormal */ x *= two54; GET_HIGH_WORD(hx,x); ix = hx&0x7fffffff; *eptr = -54; } *eptr += (ix>>20)-1022; hx = (hx&0x800fffff)|0x3fe00000; SET_HIGH_WORD(x,hx); return x; }
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